4. HTML

Check Code section - it is better to use Code block button with appropriate language

Check correct RGB color names (not values) are used - this is for Advanced Editors

Make sure the header <a name=> tags don't include the number "0" (zero). If the header includes the "0" number, then the <a name=> script includes the zero and then the header doesn't appear in the TOC. So just remove the "0" from the <a name=> script.
For example, change "<a name=SQL_Server_2008></a>" to "<a name=SQL_Server_8></a>" instead.

If you see a table which has columns cut off on the right side, you may try fixing it by adding the following tag <div style='overflow:scroll'>table here</div> (thanks to
Tord Glad Nordahl for this tip)

5. Improvements

Comments on the article - encouragement, congratulations, questions or criticisms

Combining Edits

We need to emphasize, that when you're editing an article, even if you initially came to just fix an incorrect tag or add a tag, it may be a good idea to read this article as a whole and see, if there are other things that may need fixing such as typos
or bad formatting. This way, you do most of your edits at once. If you do a lot of individual edits, it might make the author or others think that you're trying to do that on purpose. So it's best to combine edits, when possible.